<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>

<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>

<div id="app">{{ message }}</div>

<script>
    const { createApp } = Vue

    createApp({
        data() {
            return {
                items: [{ message: 'Foo' }, { message: 'Bar' }]
            }
        }
    }).mount('#app')
</script>

</html>